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DUST COLLECTOR.

o. 521,604. Patented June 19,1894.

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DUST GOLLEGTOR. No. 521,604. Patented June 19, 1894.

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EMIL R. DRAVER, OF ALLIANCE, NEBRASKA, ASSIGNOR TO FLORENCE N. DRAVER,OF SAME PLACE.

DUST-COLLECTOR.

StPECIFICA'IION forming part of Letters Patent No. 521,604, dated June19, 18Q4. Application filed September 5 1893- Serial No. 4841 (N0 model)To and whom it may concern.-

Be it known that I, EMIL R. DRAVER, a citizen of the United States,residing at Alliance,

in the county of Box Butte and State of Nebraska, have invented a newand useful Improvement in Dust-Collectors, of which the following is aspecification.

My invention relates to an improvement in the class of apparatus forseparating the dust from a current of dust-laden air.

There are various connections, or particular applications, in which dustcollectors, of the class to which my invention relates, are used; and myimprovement is adapted for use in any of these. I especially design myimprovement, however, for use in a flour-mill with a middlings-purifier,and therefore hereinafter confine the description to such use and showit applied thereto in the accompanying drawings, in which- Figure 1 is aview in sectional side elevation of a middlings-purifier provided withmy improvement; Fig. 2, a section taken at the line 2 on Fig. 1 andviewed in the direction of the arrow; Fig. 3, a view showing my improveddust-collector in cross-sectional elevation on a larger scale than thatobserved in Fig. 1; and Fig. 4, a broken longitudinal sec tion taken attheline 4: on Fig. 3 and viewed in the direction of the arrow.

A is the casing of a middlings-purifier, in which is housed my improveddust-collector. A fan 13 is located on the upper part of V the casing todraw air through the machine, as usual, namely, as represented, bysucking it through side-openings r in the casing and causing it toescape from the discharge-end r of the fan, in which is provided asuitable adjustable valve r for regulating the air-sup-' ply; or acontinuous circulation of the same air may be. had through the machineby a pipe-connection between the discharge end of the fan and thebase-portion of the casing A.

In the base of the casing and extending longitudinally thereof to anoutlet q, or outlets, at one end, is a trough 0 divided lengthwise by apartition p into two conveyer-housings 10 and 12 the conveyers O inwhich are shown as of the worm variety, though they need not be. Theworm-conveyors may be geared together at one end (a gear 0 beingshown,for the purpose, on the end of the conveyor-shaft presented toview in Fig. 1) to be driven by a belt pulley 0 on the shaft of one.

' D is a hopper in the casing, extending lengthwise thereof and seatingin the top of the trough 0, toward the center of which the sidesconverge from below the air-inlets r; and at intervals on the partitionp are valves 19 for the usual purpose of adjustment with relation to thesides of the hopper, to guide the material through it at will to one orthe other of the conveyors 0.

Above the plane of the openings r, is supported the screen E, having itsframe connected by an eccentric n with a rotary shaft n, the driving ofwhich, through its connection, indicated at x, with the driving-powering belt E, having the roller 15 at one of its 'end's geared to theshaft'n, the belt carrying a brush E to prevent clogging of the screenby operating against its under side.

. E? is the feed-hopper on one end of the top of the casing, containingthe regulating slidevalve '0 and having its outlet controlled by aroller to, which may be geared to the roller 25 through the endroller tof a conveyor G, provided for the dust-collector hereinafter described.

The parts thus far described relate to the middlings-purifier as themedium of application of my improved dust-collector, and which needinvolve in itself no features of novelty in construction or mode ofoperation.

F is the dust-collector, the primary purpose of my improved constructionthereof being to cause it to intercept so completely the dust from thedust-laden air, in the path of which the collector is interposed, as tothoroughly relieve it of the dust it carries. To this end I provide, asthe principle of my improved construction, a passage interposed in thepath to the fan of the air-current, and having. its mouth orinlet in itsupper portion, the passageleading thence downward to a dust-interceptingdeflector, whence it leads upward toward the fan. The preferred form ofthe passage referred to, from itsinlet-end downward, is that of, orapproximating, the arc of a circle; and I prefer to duplicate thepassage by providing one at each side of the dust-in- IOO terceptingdeflector, the latter form being the one illustrated, and involvingdetails of construction which may be described as follows: Two curveddeflectors m and m, the latter being supported concentrically within theformer, extend lengthwise of the casing A in a chamber A between thescreen E and the fan-chamber, from which it is separated by a horizontalpartition Z having a central longitudinal opening 1', whence extenddownward the sides 7t". Each of the deflectors m and m is, as it were, acylindrical tube cut in two, lengthwise, at its center, the two halvesof the inner tube being fastened, along their edges, to the outerlfacesof the sides is, and those of the outer tube are fastened at their loweredges along opposite sides of a trough H supported below the tubes atthe opposite ends of the casing A, in which it extends longitudinally,having a discharge-spout i, at one end, controlled by an outwardlyopening check-valve v1. The two deflectors m and m thus form the curved,or arc-shaped passages h.

I is the dust-intercepting deflector, shown in the form of acenter-board g, preferably of wood or metal, supported at its oppositeends by the ends of the casing A, in vertical position to extendcentrally in the outlet-passage between the two sides In short of theopening Z in the partition Z and below the plane of the outlet-ends ofthe passages it into the trough H, being provided along its upper edgewith a head g, and fitting along its lower edge in the longitudinal slotof a base 9 extending against the sides of the trough to preventundesired passage of air at its edges. The center-board thus deflectsthe passages h vertically upward, forming, as it were, upward extendingcontinuatious 71' thereof. In the trough H is the conveyer G, which Iprefer to provide in the form of an endless slatconveyer having anendless belt carrying cross-slats at intervals and supported on theend-rollers t and 6 Because of the obstruction presented by the lowerend-portion of the center-board, the endless-belt and slats of theslat-conveyer may be divided longitudinally to operate in the trough atopposite sides of the center-board; and between the oppositely movinglengths of each of the slatconveyer belt-sections I interpose ahingedvalve t to obstruct the passage of air while not interfering withthe travel of the conveyer, in which it is guided by the base 9 Thecenter-board g, while it may be rigid, is preferably supported, topermitit to be jarred by vertical movement through the base g between uprightguidecleats f at its opposite ends. Moreover, for the more common use ofthe center-board as a dust-intereepter, its sides should be covered withcloth e, over which screens 01 are fastened, leaving spaces between themand the cloth-covered surfaces; and as the center-board should be jarredperiodically, to shake off the accumulations upon it, I provide on theroller 25 a strikerarm c (Fig. 4) which, with each revolution of theroller, engages the adjacent beveled lower edge of the board 9 to raiseit and permit it to drop.

The operation is as follows: The moving parts of the apparatus being setin motion, and the material, say middlings, fed through the hopper Eupon the vibrating screen E (whence the residue tails off to the chuteI), through which it falls into the trough G) the fan sucks air frombelow the screen upward through the latter, and it takes up dust, fromthe material thereon, with it into the charm ber A, the only outlet fromwhich is in the collector F and afforded by the passages h, 72/, throughwhich the air-E uction draws the dustladen air, thus first in a downwarddirection, and, owing to the convex form of the passages h,centrifugally with relation to the common center of the tubes m, m,whereby the heavier particles of dust tend to seek lodgment against theinner surfaces of the outer walls of the passages h, and work their waydown into the trough II, whence the conveyer carries them to thedischarge 1'. As the air-currents leave the lower ends of the passagesit, they strike the center'board g and are thereby deflected upwardthrough the passages h, the sides of the board gathering more dust fromthe air, which is further obstructed in its upward course by theoverlapping head g' to tend thereby the better to re lease the dust; andby the time the air reaches the fan, it will be practically, orthoroughly, relieved of dust. The dust-accumulations on the sides of thecenter-board, particularly if they be clothoovered and screened, asdescribed, will contain practically all the dust carried by the air whenit emerges from the passages 71; and the screens at presentthe advantageof admitting the fine dust-particles through them to the cloth, on whichthey accumulate in flakes, which are too coarse to pass back through thescreens if they become dislodged. By jarring the center-board theaccumulations upon it are dislodged and fall upon the conveyer G, whichcarries them to the discharge-outlet t'.

As will be understood from the statement herein of the principle ofconstruction involved in my improved dust-collector, I do not intend tolimit my invention to the particular construction thereof shown anddescribed, as the same may be embodied in various forms withoutdeparture from the principle thereof; and I wish it also to beunderstood that the provision of the two passages h, h, though desirablefor the reason of the increased effect in relieving the dust-laden air,is not essential, as one passage h, 71, will operate.

What I claim as new, and desire to secure by Letters Patent, is

1. In combination with a suitable casing and a fan for forcing airthrough the same, a dust-collector interposed in the path of theair-current and containing a passage having the inlet at its upper endand leading thence downward, an outlet-passage leading from the lowerend of the inlet-passage to the fanchamber, and a dust-interceptingdeflector in said outlet-passage adjacent to the lower end of thedownward extending passage and forming the upward extension thereofleading to the outlet, substantially as described.

2. In combination with a suitable casing and a fan for forcing airthrough the same, a dust-collector interposed in the path of theair-current and containing an outwardly curved passage h having theinlet at its upper end and an upward extension h leading from its lowerend to the outlet and a dustintercepting deflecting board g forming oneside of the said extension h, substantially as described.

3. In combination with a suitable casing and a fan for forcing airthrough the same, a dust-collector interposed in the path of theair-current and containing a passage having the inlet at its upper endand leading thence downward, an outlet-passage leading from the lowerendof said inlet-passage to the fan chamber and a dust-interceptingdeflectingboard g, yieldingly supportedin said outletpassage adjacent tothe lower end of the downward-extending passage and forming the upwardextension thereof leading to the outlet, substantially as described.

'4. In combination with a suitable casing and a fan for forcing airthrough the same, a dust-collector interposed in the path of theair-current'and containing a central upright dust-interceptingdeflector, and passages, at opposite sides of the deflector, each havingthe inlet at its upper end and leading thence downward to said deflectorand branching into an upward extension h leading, between the deflectorand adjacent said passage, to the outlet, substantially as described.

5. In combination with a suitable casing and a fan for forcing airthrough the same, a dust-collector interposed in the path of theair-current and containing the outwardly curved passages h each havingthe inlet in its upper end and an upward extension h leading from itslower end to the outlet, and a dust-intercepting deflector interposedbetween the said passages and forming the said extensions, substantiallyas described.

6. In combination with a suitable casing and a fan for forcing airthrough the same, a dust-collector interposed. in the path of theair-current and containing a central upright dust-intercepting deflectorformed with a centerboard g having a head g, cloth-covered sides andscreens d, and passages h, at opposite sides of the deflector, eachhaving the inlet at its upper end and leading thence downward to saiddeflector and branching substantially as described, in the casing, and ia chamber A therein between the 'fan and air-inlet, and a dust-collectorin said chamber, containing a passage having the inlet at its upper endand leading thence downward an outlet-passage leading from the lower endof the inlet-passage to the fan chamber and a dust-interceptingdeflector in said outlet-passage adjacent to the lower end of thedownward-extending passage and forming the upward extension thereofleading to the fan, substantially as described.

8. In combination with a suitable casing having a fan B arranged in itstop portion to draw air through the casing, middlings-purifyingmechanism, substantially as described, in the casing and a chamber Atherein formed, between the fan and air-inlet, by a partition Zhaving anopening Z flanked by the sides 70, and a dust-collector in said chamberand containing an upright dust-intercepting deflector formed with aboard g supported between the said sides and curved passages h on theouter surfaces of said sides, each having the inlet at its upper end andleading thence downward to said deflector and branching into an upwardextension h leading betweenthe deflector and adjacent side It totheopening Z, substantially as set forth.

9. In combination with a'casing A having a fan B arranged in itstop-portion to draw air through the casing, middlings-purifyingmechanism, substantially as described, in the casing and a chamber Atherein formed between the fan and air-inlet, by a partition Z having anopening Z flanked by the sides Z0, and a dust-collector F in saidchamber containing. an upright dust-intercepting deflector formed with aboard g supported between said sides and provided with a head g, a baseand cloth-covered screened sides, passages h in the outer, surfaces ofsaid sides, each having the inlet at its upper end and leading thencedownward to said deflector and branching thence into an upward extensionh leading, between the deflector and adjacent side It, to the opening Z,and a trough H provided with a valvecontrolled outlet t' and containinga conveyer G provided with means for jarring the board 9, the Wholebeing c0nstructed and arranged to operate substantially as and for thepurpose set forth.

- EMIL R. DRAVER. In presence of H. V. SoHAUPP, C. D. SNYDER.

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